Mamie Lake

Mamie Lake earns a D — measurements through 2022 show persistent nutrient pressure that limits clarity through the summer. The three sub-grades — clarity, phosphorus, and chlorophyll-a — track close together, so no single parameter is dragging the average.

Eutrophic conditions are the baseline here: clarity drops noticeably in late summer, and dissolved oxygen near the bottom can become a concern. The lake bottoms out at 15 ft — a moderate depth that supports a warm-water fishery without the year-round cold refuge a deeper basin provides. The lake's 337 acres and partial shoreline records put it in the mid-range bucket — large enough for varied use, small enough that watershed inputs reach the whole basin. Mamie Lake ranks 180 of 191 in Vilas County — at the lower end of the locally monitored distribution.

An invasive species record — Banded Mystery Snail — has been logged at Mamie Lake; Wisconsin DNR maintains the official infested-waters list. Walleye are documented at Mamie Lake, one of 6 fish species on record for the lake. Public access is available — the lake is on the Wisconsin DNR public-access list. The grade is based on limited monitoring — fewer than three independent measurement years contribute, so future updates may shift the letter.